Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing our new design;

FIG. 2 is front view thereof;

FIG. 3 is a left-side thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right-side view thereof; and,

FIG. 6 is a top plan view thereof.

The bottom of the vacuum cleaner forms no part of the claimed design.

The ornamental design for a vacuum cleaner, as shown.